Power supply device, method, program, recording medium, network analyzer, and spectrum analyzer

ABSTRACT

It is possible to apply a correct power to a load even when the output impedance and a load impedance of a signal source are different from a characteristic impedance of a transmission line. The power applied to the load can be expressed by a measurement system error factor, a load coefficient X of the load, and an S parameter of the input signal R. Accordingly, a target input signal decision can decide a target value of the S parameter of the input signal R according to the power desired to be applied to the load, the measurement system error factor, and the load coefficient X of the load. Furthermore, an input signal level control section controls the input signal level so that the S parameter of the input signal R has this target value. This is performed by changing the amplification ratio of an amplification ratio variable amplifier. Thus, it is possible to apply a desired power to the load not depending on whether the impedance is matched or not.

TECHNICAL FIELD

The present invention relates to an application of a power to a load.

BACKGROUND ART

Conventionally, an electric power has been applied by a signal source toa load in network analyzers and spectrum analyzers (refer to patentdocument 1 (Japanese Laid-Open Patent Publication (Kokai) No.H11-38054), for example). The signal source and the load are connectedvia a transmission line. On this occasion, there exist the outputimpedance of the signal source, the impedance of the load, and thecharacteristic impedance of the transmission line. If the outputimpedance of the signal source and the impedance of the load match thecharacteristic impedance of the transmission line, a correct electricpower can be applied to the load.

However, the output impedance of the signal source and the impedance ofthe load are often different from the characteristic impedance of thetransmission line. In this case, a correct electric power cannot beapplied to the load. Moreover, it is difficult to manufacture a signalsource whose output impedance matches the characteristic impedance ofthe transmission line. Consequently, a correct electric power oftencannot be applied to the load.

The purpose of the present invention is to apply a correct electricpower to the load upon the output impedance of the signal source and theimpedance of the load being different from the characteristic impedanceof the transmission line.

DISCLOSURE OF THE INVENTION

According to the present invention, a power supply device that suppliesa desired electric power to a connected load, includes: an input signalmeasurement unit that measures a predetermined vector voltage relatingto an input signal before a measurement system error factor isgenerated; a reflected signal measurement unit that measures apredetermined vector voltage relating to a reflected signal resultingfrom reflection of the input signal; a signal output acquisition unitthat acquires a predetermined vector voltage relating to the inputsignal after the measurement system error factor is generated; ameasurement system error factor acquisition unit that acquires themeasurement system error factor based on the measurement results of theinput signal measurement unit, the reflected signal measurement unit,and the signal output acquisition unit; a load measurement unit thatmeasures a predetermined vector voltage relating to the load based onthe measurement system error factor, and the measurement results of theinput signal measurement unit and the reflected signal measurement unitupon the load being connected; a target value decision unit that decidesa target value of the predetermined vector voltage relating to the inputsignal based on the measurement system error factor, the predeterminedvector voltage relating to the load, and the desired electric power; andan input signal level control unit that controls the level of the inputsignal so that the predetermined vector voltage relating to the inputsignal takes the target value.

The electric power applied to the load is represented by the measurementsystem error factors, the predetermined vector voltage relating to theload, and the predetermined vector voltage relating to the input signal.Thus, the target value decision unit decides the target value of thepredetermined vector voltage relating to the input signal based on thedesired power to be applied to the load, the measurement system errorfactors, and the predetermined vector voltage relating to the load.Moreover, the input signal level control unit controls the level of theinput signal so that the predetermined vector voltage relating to theinput signal takes the target value. It is thus possible to apply thedesired electric power to the load whether the impedances match or not.

According to the power supply device of the present invention, thereflected signal measurement unit may measure the predetermined vectorvoltage relating to the reflected signal resulting from reflection ofthe input signal from a calibration tool connected to the power supplydevice; and the calibration tool may realize three types of states:open, short-circuit, and standard load.

According to the power supply device of the present invention, thepredetermined vector voltage may be the S parameter or the power.

A network analyzer or a spectrum analyzer may include the power supplydevice.

According to another aspect of the present invention, a power supplymethod for supplying a desired electric power to a connected load,includes: an input signal measurement step that measures a predeterminedvector voltage relating to an input signal before a measurement systemerror factor is generated; a reflected signal measurement step thatmeasures a predetermined vector voltage relating to a reflected signalresulting from reflection of the input signal; a signal outputacquisition step that acquires a predetermined vector voltage relatingto the input signal after the measurement system error factor isgenerated; a measurement system error factor acquisition step thatacquires the measurement system error factor based on the measurementresults of the input signal measurement step, the reflected signalmeasurement step, and the signal output acquisition step; a loadmeasurement step that measures a predetermined vector voltage relatingto the load based on the measurement system error factor, and themeasurement results of the input signal measurement step and thereflected signal measurement step upon the load being connected; atarget value decision step that decides a target value of thepredetermined vector voltage relating to the input signal based on themeasurement system error factor, the predetermined vector voltagerelating to the load, and the desired electric power; and an inputsignal level control step that controls the level of the input signal sothat the predetermined vector voltage relating to the input signal takesthe target value.

Another aspect of the present invention is a program of instructions forexecution by the computer to perform a power supply process of a powersupply device that supplies a desired electric power to a connectedload, having: an input signal measurement unit that measures apredetermined vector voltage relating to an input signal before ameasurement system error factor is generated; a reflected signalmeasurement unit that measures a predetermined vector voltage relatingto a reflected signal resulting from reflection of the input signal; anda signal output acquisition unit that acquires a predetermined vectorvoltage relating to the input signal after the measurement system errorfactor is generated; the power supply process including: a measurementsystem error factor acquisition step that acquires the measurementsystem error factor based on the measurement results of the input signalmeasurement step, the reflected signal measurement step, and the signaloutput acquisition step; a load measurement step that measures apredetermined vector voltage relating to the load based on themeasurement system error factor, and the measurement results of theinput signal measurement step and the reflected signal measurement stepupon the load being connected; a target value decision step that decidesa target value of the predetermined vector voltage relating to the inputsignal based on the measurement system error factor, the predeterminedvector voltage relating to the load, and the desired electric power; andan input signal level control step that controls the level of the inputsignal so that the predetermined vector voltage relating to the inputsignal takes the target value.

Another aspect of the present invention is a computer-readable mediumhaving a program of instructions for execution by the computer toperform a power supply process of a power supply device that supplies adesired electric power to a connected load, having: an input signalmeasurement unit that measures a predetermined vector voltage relatingto an input signal before a measurement system error factor isgenerated; a reflected signal measurement unit that measures apredetermined vector voltage relating to a reflected signal resultingfrom reflection of the input signal; and a signal output acquisitionunit that acquires a predetermined vector voltage relating to the inputsignal after the measurement system error factor is generated;including: a measurement system error factor acquisition step thatacquires the measurement system error factor based on the measurementresults of the input signal measurement step, the reflected signalmeasurement step, and the signal output acquisition step; a loadmeasurement step that measures a predetermined vector voltage relatingto the load based on the measurement system error factor, and themeasurement results of the input signal measurement step and thereflected signal measurement step upon the load being connected; atarget value decision step that decides a target value of thepredetermined vector voltage relating to the input signal based on themeasurement system error factor, the predetermined vector voltagerelating to the load, and the desired electric power; and an inputsignal level control step that controls the level of the input signal sothat the predetermined vector voltage relating to the input signal takesthe target value.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a block diagram showing the configuration of a power supplydevice 1 according to an embodiment of the present invention;

FIG. 2 is a chart as a signal flow graph representing the state shown inFIG. 1;

FIG. 3 is a block diagram showing the configuration of a measurementsystem error factor acquisition section 50;

FIG. 4 is a block diagram showing the state where a calibration tool 4is connected to a signal source 10 (FIG. 4( a)) and the exteriors of thecalibration tool 4 (FIGS. 4( b) to (e));

FIG. 5 is a chart as a signal flow graph representing the state wherethe calibration tool 4 is connected to the signal source 10;

FIG. 6 is a signal flow graph representing the state shown in FIG.5.

FIG. 7 is a flowchart showing the operation of the embodiment of thpresent invention; and

FIG. 8 is a flowchart showing the operation upon measurement systemerror factors being measured.

BEST MODE FOR CARRYING OUT THE INVENTION

A description will now be given of an embodiment of the presentinvention with reference to drawings.

FIG. 1 is a block diagram showing the configuration of a power supplydevice 1 according to the embodiment of the present invention. A load 2is connected to the power supply device 1. The power supply device 1supplies the load 2 with an electric power PL. The load 2 includes aninput terminal 2 a.

The power supply device 1 is provided with a signal source 10, ameasurement system error factor recording section 30, a load coefficientmeasurement section 40, a measurement system error factor acquisitionsection 50, a power meter terminal 60, a signal output acquisitionsection 62, a target input signal decision section 70, and an inputsignal control section 80.

The signal source 10 supplies the load 2 with a signal. The signalsource 10 includes a signal output section 12, an amplification factorvariable amplifier 13, bridges 14 a and 14 b, a receiver (RS) 16 a(input signal measurement means), a receiver (TS) 16 b (reflected signalmeasurement means), and an output terminal 18.

The signal output section 12 outputs an input signal. The input signalis a signal whose voltage is a sinusoidal wave, for example.

The amplification factor variable amplifier 13 changes the amplitude ofthe input signal output by the signal output section 12. It should benoted that the ratio (amplification factor) between the output amplitudeand the input amplitude of the amplification factor variable amplifier13 is variable. The amplification factor of the amplification factorvariable amplifier 13 is controlled by the input signal control section80.

The bridge 14 a supplies the receiver (RS) 16 a with the signal outputby the signal output section 12. The signal supplied by the bridge 14 ais considered as a signal which is not influenced by the measurementsystem error factors caused by the signal source 10. The bridge 14 bsupplies the receiver (TS) 16 b with a reflected signal, which is theinput signal output from the output terminal 18, and then is reflectedback. It should be noted that the bridges 14 a and 14 b may be powersplitters or couplers.

The receiver (RS) 16 a (input signal measurement means) measures the Sparameter of a signal received via the bridge 14 a. The receiver (RS) 16a thus measures the S parameter relating to the input signal beforeinfluencing of the measurement system error factors caused by the signalsource 10.

The receiver (TS) 16 b (reflected signal measurement means) measures theS parameter of a signal received via the bridge 14 b. The receiver (TS)16 b thus measures the S parameter relating to the reflected signal.

The output terminal 18 is a terminal used to output the input signal.

The measurement system error factor recording section 30 records themeasurement system error factors of the power supply device 1. Themeasurement system error factors include Ed (error resulting from thedirection of the bridge), Er1 and Er2 (errors resulting from thefrequency tracking), Es (error resulting from the source matching), andEt. FIG. 2 is representation as a signal flow graph of the state shownin FIG. 1. X is a load coefficient of the load 2 and the like connectedto the power supply device 1.

The load coefficient measurement section 40 measures the loadcoefficient X relating to the load 2 based on the measured data (Sparameters) of the receiver (RS) 16 a (input signal measurement means)and the receiver (TS) 16 b (reflected signal measurement means) upon theload 2 being connected to the power supply device 1, and the measurementsystem error factors recorded by the measurement system error factorrecording section 30. It should be noted that the measured data by thereceiver (RS) 16 a (input signal measurement means) is denoted as R, andthe measured data by the receiver (TS) 16 b (reflected signalmeasurement means) is denoted as T.

The load coefficient measurement section 40 measures the loadcoefficient X of the load 2 according to the following equation.

$\begin{matrix}{X = \frac{1}{{Es} + \frac{{Er1}\mspace{14mu}{Er}\; 2}{\frac{T}{R} - {Ed}}}} & \left\lbrack {{Equation}\mspace{14mu} 1} \right\rbrack\end{matrix}$

The measurement system error factor acquisition section 50 acquires themeasurement system error factors (Ed, Er1, Er2, Es) based on themeasurement results of the receiver (RS) 16 a (input signal measurementmeans), the receiver (TS) 16 b (reflected signal measurement means), andthe signal output acquisition section 62. Upon the acquisition of themeasurement system error factors, the calibration tool 4 and the powermeter 6 are sequentially connected to the signal source 10.

FIG. 3 shows the configuration of the measurement system error factoracquisition section 50. The measurement system error factor acquisitionsection 50 includes a switch 52, a first measurement system error factoracquisition section 54, and a second measurement system error factoracquisition section 56.

The switch 52 receives measured data (such as the S parameters) from thereceiver (RS) 16 a (input signal measurement means) and the receiver(TS) 16 b (reflected signal measurement means), and outputs thesesignals to either the first measurement system error factor acquisitionsection 54 or the second measurement system error factor acquisitionsection 56 according to the type of what is connected to the signalsource 10.

Namely, the switch 52 outputs the measured data (such as the Sparameters) received from the receiver (RS) 16 a and the receiver (TS)16 b to the first measurement system error factor acquisition section 54if the calibration tool 4 is connected to the signal source 10, or tothe second measurement system error factor acquisition section 56 if thepower meter 6 is connected to the signal source 10.

The first measurement system error factor acquisition section 54receives the measured data of the receiver (RS) 16 a and the receiver(TS) 16 b upon the calibration tool 4 being connected to the signalsource 10, and acquires Ed, Es, and Er1·Er2 (the product of Er1 andEr2). FIG. 4( a) shows the state where the calibration tool 4 isconnected to the signal source 10. A terminal 4 a of the calibrationtool 4 is connected to the output terminal 18 of the signal source 10.It should be noted that parts other than the signal source 10 of thenetwork analyzer 1 are omitted the in FIG. 4( a). The calibration tool 4is a widely known one which realizes three states: open, short-circuit,and load (standard load Z0) as described in the Japanese Laid-OpenPatent Publication (Kokai) No. H11-38054.

The exterior of the calibration tool 4 is shown in FIG. 4( b), and thecalibration tool 4 includes a connector 4 a and a main unit 4 b. FIG. 4(c) shows an open element, and although a terminal 4 c is open, a straycapacitance C exists. FIG. 4( d) shows a short-circuit element, and aterminal 4 d is short-circuited. FIG. 4( e) is a load element, and aterminal 4 e is terminated by the standard load (impedance) Z0.

FIG. 2 shows the state represented as a signal flow graph where thecalibration tool 4 is connected to the signal source 10. The measureddata of the receiver (RS) 16 a is denoted as R, and the measured data ofthe receiver (TS) 16 b is denoted as T. X represents the loadcoefficient of the calibration tool 4. The relationship between R and Tis represented by the following equation.

$\begin{matrix}{\frac{T}{R} = {{Ed} + \frac{{Er}\; 1{Er}\;{2 \cdot X}}{1 - {EsX}}}} & \left\lbrack {{Equation}\mspace{14mu} 2} \right\rbrack\end{matrix}$

Since the three types of the calibration tool 4 are connected, threetypes of combination of R and T are obtained. Accordingly, obtainedvariables are the three types of the variables: Ed, Es, and Er1·Er2.

The second measurement system error factor acquisition section 56acquires the measured data of the receiver (RS) 16 a: Ed, Es, andEr1·Er2 (measurement system error factors acquired by the firstmeasurement system error factor acquisition section 54), and receivesthe output (power P) of the signal output acquisition section 62, andacquires Er1 and Er2 upon the power meter 6 being connected to thesignal source 10 and the power meter terminal 60.

FIG. 5 shows the state where the power meter 6 is connected to thesignal source 10 and the power meter terminal 60. It should be notedthat parts other than the signal source 10 of the network analyzer 1 andthe power meter terminal 60 are omitted in FIG. 6. A terminal 6 a of thepower meter 6 is connected to the output terminal 18 of the signalsource 10. The terminal 6 b of the power meter 6 is connected to thepower mater terminal 60. The power meter 6 measures the power of thesignal received via the terminal 6 a. The signal output acquisitionsection 62 acquires the power P via the power meter terminal 60 and theterminal 6 b, and outputs the power P to the second measurement systemerror factor acquisition section 56.

FIG. 6 shows the state as a signal flow graph where the power meter 6 isconnected to the signal source 10 and the power meter terminal 60. Themeasured data of the receiver (RS) 16 a is denoted as R, and themeasured data of the power meter 6 is denoted as P. As is clearly shownin FIG. 6, P is a vector voltage relating to the input signal, and isacquired after the measurement system error factors are generated. Therelationship between R and P is represented by the following equation.

$\begin{matrix}{\frac{P}{R} = \frac{{Er}\; 1}{1 - {EsEp}}} & \left\lbrack {{Equation}\mspace{14mu} 3} \right\rbrack\end{matrix}$

In this equation, Es is known, Ep can be measured, and Er1 is thusobtained. Since Er1·Er2 is known, Er2 can also be obtained. In this way,it is possible to obtain Er1 and Er2, which are mutually opposite indirection in the signal flow graph (refer to FIG. 6), from Er1·Er2.Namely, it is possible to separate Er1 and Er2, which are combined asEr1·Er2.

The first measurement system error factor acquisition section 54receives the measured data of the receiver (RS) 16 a (input signalmeasurement means) and the receiver (TS) 16 b (reflected signalmeasurement means) to acquire Ed, Es, Er1·Er2. The second measurementsystem error factor acquisition section 56 receives the measured data ofthe receiver (RS) 16 a (input signal measurement means) and the signaloutput acquisition section 62 to acquire Er1 and Er2. Thus, the firstmeasurement system error factor acquisition section 54 and the secondmeasurement system error factor acquisition section 56 acquires themeasurement system error factors (Ed, Es, Er1, Er2) based on themeasured data of the receiver (RS) 16 a (input signal measurementmeans), the receiver (TS) 16 b (reflected signal measurement means), andthe signal output acquisition section 62.

The power meter terminal 60 is connected to the terminal 6 b of thepower meter 6. The signal output acquisition section 62 acquires thepower P via the power meter terminal 60 and the terminal 6 b, andoutputs the power P to the second measurement system error factoracquisition section 56. The power P is a signal acquired after theinfluence of the measurement system error factors caused by the signalsource 10 are generated.

The target input signal decision section 70 decides a target value ofthe S parameter of the input signal R based on the measurement systemerror factors (Ed, Es, Er1, Er2), the load coefficient X of the load 2,and the desired electric power PL applied to the load 2.

The electric power PL applied to the load 2 is represented as thefollowing equation.

$\begin{matrix}{{PL} = {|a|^{2} = \left| {\frac{{Er}\; 1}{1 - {EsX}}{||}R} \right|^{2}}} & \left\lbrack {{Equation}\mspace{14mu} 4} \right\rbrack\end{matrix}$

The S parameter of the input signal R is thus represented as thefollowing equation.

$\begin{matrix}{|R| = \frac{\sqrt{PL}}{\left| \frac{{Er}\; 1}{1 - {EsX}} \right|}} & \left\lbrack {{Equation}\mspace{14mu} 5} \right\rbrack\end{matrix}$

It is thus possible to obtain the target value of the S parameter of theinput signal R by assigning the target value of the electric power PL,Er1, Es, and X to the above equation. The electric power PL achieves thetarget value if the S parameter of the input signal R is caused to takethis target value.

The input signal control section 80 controls the level of the inputsignal so that the S parameter of the input signal R takes the targetvalue obtained by the target input signal decision section 70. The inputsignal control section 80 controls the level of the input signal bychanging the amplification factor of the amplification factor variableamplifier 13.

A description will now be given of the operation of the embodiment ofthe present invention. FIG. 7 is a flowchart showing the operation ofthe embodiment of the present invention.

The power supply device 1 first measures the measurement system errorfactors (Ed, Es, Er1, Er2) (S10). The measured measurement system errorfactors are recorded in the measurement system error factor recordingsection 30. A description will now be given of the operation upon themeasurement system error factors being measured with reference to aflowchart in FIG. 8.

The three types of the calibration tool 4 are first connected to thesignal source 10. The signal output section 12 outputs the input signal.On this occasion, the receiver (RS) 16 a measures the input signal. Theinput signal is input to the calibration tool 4 via the output terminal18. The receiver (TS) 16 b then measures the reflected signal reflectedby the calibration tool 4. The first measurement system error factoracquisition section 54 receives the measured data of the receiver (RS)16 a and the receiver (TS) 16 b to acquire Ed, ES, and Er1·Er2 (theproduct of Er1 and Er2) (S102).

The power meter 6 is then connected to the signal source 10 and thepower meter terminal 60. The signal output section 12 outputs the inputsignal. On this occasion, the receiver (RS) 16 a measures the inputsignal. The input signal is input to the power meter 6 via the outputterminal 18 and the terminal 6 a. The power meter 6 measures the power Pof the input signal. The signal output acquisition section 62 thenacquires the power P via the power meter terminal 60 and the terminal 6b, and outputs the power P to the second measurement system error factoracquisition section 56. The second measurement system error factoracquisition section 56 receives the measured data Ed, Es, and Er1·Er2 ofthe receiver (RS) 16 a (measurement system error factors acquired by thefirst measurement system error factor acquisition section 54), and theoutput (power P) of the signal output acquisition section 62 to acquireEr1 and Er2 (S104).

Returning to FIG. 7, the load 2 is connected to the power supply device1 (refer to FIG. 1), and the S parameter of the input signal R and the Sparameter of the reflected signal T are actually measured (S20). Namely,the signal output section 12 outputs the input signal. On this occasion,the receiver (RS) 16 a measures the input signal. The data obtained bythis measurement is R. The input signal is input to the DUT 2 via theoutput terminal 18. The receiver (TS) 16 b then measures the reflectedsignal reflected by the DUT 2. The data obtained by this measurement isT.

The load coefficient measurement section 40 then decides the loadcoefficient X of the load 2 (S30). Namely, the load coefficientmeasurement section 40 measures the load coefficient X of the load 2based on the measured data (S parameters) of the receiver (RS) 16 a(input signal measurement means) and the receiver (TS) 16 b (reflectedsignal measurement means) upon the load 2 being connected to the powersupply device 1, and the measurement system error factors recorded bythe measurement system error factor recording section 30.

The target input signal decision section 70 then decides the targetvalue of the S parameter of the input signal R based on the measurementsystem error factors (Ed, Es, Er1, Er2), the load coefficient X of theload 2, and the target value of the electric power PL applied to theload 2 (S40).

The input signal control section 80 controls the level of the inputsignal so that the S parameter of the input signal R takes the targetvalue obtained by the target input signal decision section 70 (S50).

With the embodiment according to the present invention, the electricpower PL applied to the load can be represented by the measurementsystem error factors (Er1, Es), the load coefficient X of the load 2,and the S parameter of the input signal R (refer to Equation 4). Thetarget input signal decision section 70 thus can decide the target valueof the S parameter of the input signal R based on the desired electricpower to be applied to the load 2, the measurement system error factors(Er1, Es), and the load coefficient X of the load 2 (refer to Equation5). The input signal level control section 80 controls the level of theinput signal so that the S parameter of the input signal R takes thetarget value. This is carried out by changing the amplification factorof the amplification factor variable amplifier 13. It is thus possibleto apply the desired power to the load whether the impedances match ornot.

In the above-mentioned embodiment, a computer provided with a CPU, ahard disk, and a media (floppy disk, CD-ROM, and the like) readingdevice is caused to read a medium recording a program which realizes theabove-mentioned respective elements, and to install the program on thehard disk. The power supply device 1 can also be realized in this way.

1. A power supply device that supplies a desired electric power to aconnected load connected to an output terminal, comprising: an inputsignal measurer that measures a predetermined vector voltage relatingrelated to an input signal before a measurement system error factor isgenerated; a reflected signal measurer that measures a predeterminedvector voltage related to a reflected signal resulting from reflectionof the input signal; a signal output acquisitioner that acquires apredetermined vector voltage related to the input signal from a powermeter directly connected to the output terminal, after the measurementsystem error factor is generated; a measurement system error factoracquisitioner that acquires the measurement system error factor based onmeasurement results of said input signal measurer, said reflected signalmeasurer, and said signal output acquisitioner; a load measurer thatmeasures a predetermined vector voltage related to the load based on themeasurement system error factor, and the measurement results of saidinput signal measurer and said reflected signal measurer upon the loadbeing connected; a target value decider that decides a target value ofthe predetermined vector voltage related to the input signal based onthe measurement system error factor, the predetermined vector voltagerelated to the load, and the desired electric power; and an input signallevel controller that controls a level of the input signal so that thepredetermined vector voltage related to the input signal takes thetarget value.
 2. The power supply device according to claim 1, whereinsaid reflected signal measurer measures the predetermined vector voltagerelated to the reflected signal resulting from reflection of the inputsignal from a calibration tool connected to the power supply device; andwherein said calibration tool realizes three types of states: open,short-circuit, and standard load.
 3. The power supply device accordingto claim 2, wherein the predetermined vector voltage comprises one of anS parameter and power.
 4. A network analyzer comprising the power supplydevice according to claim
 3. 5. A spectrum analyzer comprising the powersupply device according to claim
 3. 6. A network analyzer comprising thepower supply device according to claim
 2. 7. A spectrum analyzercomprising the power supply device according to claim
 2. 8. The powersupply device according to claim 1, wherein the predetermined vectorvoltage comprises one of an S parameter and power.
 9. A network analyzercomprising the power supply device according to claim
 8. 10. A spectrumanalyzer comprising the power supply device according to claim
 8. 11. Anetwork analyzer comprising the power supply device according toclaim
 1. 12. A spectrum analyzer comprising the power supply deviceaccording to claim
 1. 13. The power supply device of claim 1, furthercomprising an amplification factor variable amplifier that changes theamplitude of the input signal, wherein an amplification factor of theamplification factor variable amplifier is variably controlled by theinput signal level controller.
 14. A power supply method for supplying adesired electric power to a connected load connected to an outputterminal, comprising: measuring a predetermined vector voltage relatedto an input signal before a measurement system error factor isgenerated; measuring a predetermined vector voltage related to areflected signal resulting from reflection of the input signal;acquiring a predetermined vector voltage related to the input signalfrom a power meter directly connected to the output terminal, after themeasurement system error factor is generated; acquiring the measurementsystem error factor based on the measuring of the predetermined vectorvoltage related to the input signal before the measurement system errorfactor is generated, the measuring of the predetermined vector voltagerelated to the reflected signal resulting from reflection of the inputsignal, and the acquiring of the predetermined vector voltage related tothe input signal after the measurement system error factor is generated;measuring a predetermined vector voltage related to the load based onthe measurement system error factor, and the measurement results of thepredetermined vector voltage related to the input signal before themeasurement system error factor is generated and the predeterminedvector voltage related to the reflected signal resulting from reflectionof the input signal upon the load being connected; deciding a targetvalue of the predetermined vector voltage relating to the input signalbased on the measurement system error factor, the predetermined vectorvoltage relating to the load, and the desired electric power; andcontrolling a level of the input signal so that the predetermined vectorvoltage relating to the input signal takes the target value.
 15. Thepower supply method of claim 14, further comprising: changing theamplitude of the input signal, and controlling a variable amplificationfactor between an output amplitude and an input amplitude.
 16. Acomputer-readable medium having a program of instructions for executionby a computer to perform a power supply process of a power supply devicethat supplies a desired electric power to a connected load connected toan output terminal, having an input signal measurer that measures apredetermined vector voltage related to an input signal before ameasurement system error factor is generated; a reflected signalmeasurer that measures a predetermined vector voltage related to areflected signal resulting from reflection of the input signal; and asignal output acquisitioner that acquires a predetermined vector voltagerelated to the input signal from a power meter directly connected to theoutput terminal, after the measurement system error factor is generated;said power supply process comprising: acquiring the measurement systemerror factor based on measurement results of the input signal measurer,the reflected signal measurer, and the signal output acquisitioner;measuring a predetermined vector voltage related to the load based onthe measurement system error factor, and measurement results of theinput signal measurer and the reflected signal measurer upon the loadbeing connected; deciding a target value of the predetermined vectorvoltage related to the input signal based on the measurement systemerror factor, the predetermined vector voltage relating to the load, andthe desired electric power; and controlling a level of the input signalso that the predetermined vector voltage relating to the input signaltakes the target value.
 17. The computer-readable medium of claim 16,wherein the power supply process further comprises: changing theamplitude of the input signal, and controlling a variable amplificationfactor between an output amplitude and an input amplitude.